Which tds meter do you guys recommend?
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Blue Lab for the win 
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I heard about Blue Lab being a great brand. What about any for under 20?
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I’ve had several cheap TDS pens with no issues, don’t cheap out on the PH pen though
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An Apera PC60 measures both pH and PPM. You will struggle to find a PPM meter that get the job done for < $20.
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I spent 50 on Apera 20 PH pen
Apera and Bluelab both offer great PPM/EC pins.
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Do not forget the old adage…You get what you pay for. BL and Apera are solid and alot of us use them.
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Just so you know Brother. This is not for TDS. Apera makes a multi tool but the pH20 is for pH only and the TDS20 is for PPM’s.
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Yes I know. I was just looking at that meter on amazon. Should I give it a shot?
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I was referring to your original query about a PPM/TDS pen. Then you said you bought the Apera 20 pH pen. 
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Absolutely.
I’d question if the meter in that Amazon link would maintain its calibration for more than a couple of months.
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I just ordered the one from the link you sent me. I didn’t cheap out on the PH pen tho.
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Happy growing!
Start a journal here and we’ll help you along the way. Post pics, questions, and progress. You’ll get recommendations in the process.
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That one with proper care and storage will last you awhile. Years. Just need to calibrate once in awhile, not cuz it is out of whack, more a calibration QC check.
Talking about the Apera. Not the Off Brand link. I was just looking for under 20.00 options and that came up.
Good luck on your grows!!
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I will thank you!
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How far should my grow light be from my plants? I have one plant that’s getting tall and close to light.
I use the apera for pH testing in hydro its well worth the investment. To measure TDS I just use this or a similar one to monitor nutrient strength or salt build up in my system. I have like 5 of them sitting around they all read the within 30 ppm of each other.
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How are ppms adjusted when too high or too low?
I use DLI for this and never get closer than 12" from top of canopy to light.